Device for calculating or computing purposes



H. AND F. BROTHERTON. DEVICE FOR CALCULATING 0R COMPUTING PURPOSES.

APPLXCATION FILED MAY 9, 1921.

Patented Aug. 1, 1922.

UNITED STATES.

HARRISON nnornnn'ron, or BRIERFIELD, AND FRANK snornnnron, or BownoN,

PATENT OFFICE.

ENGLAND.

DEVICE non CALCULATING on COMPUTING PURPOSES.

T c all whom it may con-cem- Be it known that we, Haiti-neon King ofGreat Britain, residing, respectively, at Brlerfield and Bowdon,England,

have invented certain new and useful lm provements in Devices forCalculating or Computing Purposes, of which the following is aspecification.

The invention is for a device wherewith calculations or computationsmaybe made, and has for object the provision of means for rendering thedevice simple and effective in use, said means involving the employmentof a fixed dial or dials (on which the necessary scales are marked 'orprovided) relatively to the body of the device itself.

The. accompanying drawings illustrate forms of our invention by way ofexamples, and in which Fig. 1 is a vertical section, and Fig. 2 asimilar view at right angles therewith, of a calculating or computingdevice referred to. Fig. 3 is, a part plan View of Fig. 1, an upperportion of the latter being removed. Fig. i is a similar part-plan viewwith said portion included.

In the aforesaid views the cover glass or transparency provided forconveniently closing in the contained parts, but without interferingwith the view of the same, has been omitted for the sake ofclearness.

Fig. 5 shows in part, a sectional view of a modified or cheaper form ofdevice, as compared with the one previously referred to. Figs. 6 and 7are respectively sectional elevation and plan views of a modifieddetail.

With reference to Figs. 1 to a inclusive,a is the casing of the deviceor instrument, at the central part of which is shown attached orsoldered a base block Z), through which a pin 6 is passed and connectedby screw thread therein. The upper end of 5 forms a pivot for a spindlec, the extended base part c of which is "attached in any convenientmanner to a disc d, and hereinafter referred to as a brake-disc.

A sleeve of collar 6 is shown about the spindle c, and capable of movingfreely around the same. According to our invention, an extension 6 fromc 1s 1n fIlCtIOHalCOHtELCt with the upper surface of the brake-disc d.

. That is to say, the collar device 6 e carries round the disc d byfriction only, and when the motion of at is arrested orpre'vented, themotion of spindle 0 attached to it also ceases.

Specification of Letters Patent. Patented Application filed May Q, 1921.Serial No. 468,097.

Bnornna TON and FRANK BROTHERTON, sub ects of the fis abridge piececonnected'to the base of the casing a, and supporting revoluble gearwheels 9 depending from it. 'These wheels are capable of being driven bymeans of a small crown wheel 9 at the one extremity, and of driving agear wheel 9 the latter being fixed to the. collar 0 aforesaid. I

The gears g, g, g are merely indicated slightly detached for thesake ofclearness.

Attached to the collar 6 is a disc 71, on

whichis marked a radial line M, (Fig. 4) to form the equivalent of apointer.

c is a transparency, (such as celluloid) fixed in position within thecasing a in any suitable manner, and with a central hole, so asto bequite clear of the collar 6 or the part of the spindle c projectingabove the latter.

This transparency or disc 11 has marked upon it suitable divisions,according to the use of the device intended, a few of which divisionmarks being indicated merely at i in Fi 4:.

A Turther transparent disc A is shown above the disc 2', which formerdisc isattached to the upper end of the spindle c.

Such disc is also has a radial line marked upon it'to form theequivalent of another pointer; said pointer equivalent is indicated at kin Fig. 4. i

[is a push-button passing through and freely mounted in the casing w ofthe device, the inner end of which button device or spin dle is capableof coming in contact with the periphery of the brake-disc cl at will.The device Z is shown restrained by a flat or plate spring m, saidspring being connected to the casing a by means of connections such asat m at its two extremes, (Fig. 3). Said extremes are assumed to beslotted for being capable of working on the shanks of the pins m and thespindle of Z passes through a central hole in said spring. The latterbears against a shoulder on thedevice named.

In this manner the movement of the brake-disc d may be arrested orprevented when desirable. On the other hand, the movement of the collar6 is under the control of a revolublemilled-head device a, the spindleof the latter having the crown wheel g free to move, said brake-disc andspindle c are also carried round by frictional contact with 6 and bothpointers if, move simultaneously and equally around the circular path.But if the disc d be braked, and thus prevented from moving, the collardevice 6, 6 under the action of the gears referred to, moves about itsaxis independently of the disc (Z and spindle c.

In this latterevent, the upper pointer or marking k remains stationary,and the one indicated at 7& moves round independently.

In practice, the distance betwcen'the discs 71., 7c, and the marked disci would be made as small as possible.

In the modification shown in Figs. 6 and 7, illustrating a furtherapplication of our invention the collar 6 has an extended or frictionalpart 6 in the form of a plate spring, for ensuring suilicient frictionalcontact between itself and disc (5.

In the modified form of instrument indicated partly in Fig. 5, thespindle c has pivoted to its lower end external to the casing a? a pairof wings or arms 0 (one being shown in full lines only for the sakeofdistinction).

The arms aforesaid are assumed to be shown in the open condition, forenabling them to be taken by the thumb and finger of the user, andtwisted for the purpose of turning spindle 0.

Attached to spindle c is disc it provided with a pointer marking asbefore, and in frictional contact with /72, accordingto our invention isthe extension a of collar device 0 c is capable of freely moving aroundspindle c, and the transparent disc is is attached to its upper endpart. i is the transparent disc between J1. and 70, on which a suitablescale is marked circumferentially.

A button or like brake device (not shown) is capable or arresting orpreventing the movement of disc I: in the present example, when the discit may be moved independently by the operation of the wing device 0. hennot in use, said parts of the device 0 may be folded inwards, asindicated by arrow line, so as to lie within a recess in the base of thecasing It will be seen, with reference to Fig. 5, that no gearing as inFigs 1 to 4, is neces sary, the pointer disc 7: being braked directly,and the device 0 being capable of moving the disc h.

We prefer that the uppermost pointer be the one which is capable ofbeing arrested in its motion during operation of the milled head devicea or equivalent.

The operation of the device is similar to what has been accomplishedwith other "forms of like devices employing a fixed dial and movablepointers or equivalents.

For example, to obtain the simple result of 2X3, the milledhead device ais twisted until the pointer 70 comes to the number marked 1 on thescale, the position of the other pointer 71,1 being immaterial. Now thebutton Z is pressed and whilst this brake pressure is maintained theturning of the milled head device a is continued until the pointer Itcomes to the number 2. The pointer 7L is now in advance of the pointer kby a scale length representing log. 2. The pressure on Z is thenreleased. and the rotation of a continued, both pointers movesimultaneously and equally along the scale, so that this constant scaledistance of amount log. :2 between them maintained. Therefore, when thepointer 71 1 comes to 3, thus traversing a scale length representinglog. 3 from the ark 1, the other pointer 1L has reached the position orscale length representing log. 2 plus log. 3, from the mark 1, and hencethe pointer J25 points to the 'number representing the productSimilarly, to obtain the result of for example, the pointer 713 set tothe mark 1 on the scale as before, and again, whilst the brake pressureon Z is maintained, the pointer 7L is set to the number 2. If new thebrake pressure is released, and the rotation of n continued, the twopointers move simultaneously and equally along the scale with theconstant scale length representing log. 2 .between them, so that whenthe pointer it has come to'the mark 8, the other pointer ls has reachedthe position representinga scale length of log. 8 minus log. 2, andhence the pointer 70 has reached the position corresponding to thequotient Q.

In the example of Fig. 1, the particular disc (5 capable of being brakedis a matter of choice, the instrument being here arranged to that end.Also, we prefer to use markings on transparent surfaces. instead ofusing actual pointers, because of the tendency of the latter to becomebent or deformed sometimes.

We claim In a device of the kind specified, a centrally mounted collarwith a broad flange bearing against a pointer disc connection solely forforming connective frictional means whereby the motion of the onepointer disc is transmitted to a second one, when the braking operationis not introduced, and an externally operated button braking devicecapable of bearing peripherally against one of said pointer discconnection when required, substantially as herein set forth.

In testimony whereof we have affixed our signatures.

HARRISON, BROTHER-TON. FRANK BROTHERTON.

